Home › Pests & diseases › White Rust
White Rust: signs and treatment in Jamaica
An oomycete disease commonly affecting leafy greens like Callaloo and Pak Choi. PlantArmor's crop guides list white rust as a common problem on leafy veg (callaloo/pak choi).
Signs to look for
- White, chalky, blister-like pustules on leaf undersides
- Yellow spots on the upper leaf surface directly above the pustules
- Distorted leaf growth
What to do
Crops it affects
Questions growers ask
How do I recognise white rust?
An oomycete disease commonly affecting leafy greens like Callaloo and Pak Choi. The signs to look for: White, chalky, blister-like pustules on leaf undersides. Yellow spots on the upper leaf surface directly above the pustules. Distorted leaf growth.
What should I do about white rust?
Destroy infected leaves. Apply protectant fungicides like Mancozeb. Ensure good drainage and air circulation. Always read the product label and observe the registered rate, re-entry period and pre-harvest interval before you apply any pesticide.
Which crops are affected by white rust in Jamaica?
PlantArmor's crop guides list white rust as a common problem on leafy veg (callaloo/pak choi).
Check it in the field
PlantArmor's reference library works offline, so you can compare what you are seeing against it standing in the plot, then log the spray you use along with its re-entry and pre-harvest intervals. Free to use.
This description and treatment come from the same reference library the PlantArmor app uses in the field. Pesticide registrations and permitted uses change — always read the current product label and observe the stated rate, re-entry period and pre-harvest interval.